<template>
  <div id="cryptos">
    <div class="scan font-28" v-if="scancode">
      <qrcode-stream @decode="onDecode" @init="onInit" style="height: 100vh;">
        <div>
          <div class="qr-scanner">
            <div class="box">
              <div class="line"></div>
              <div class="angle"></div>
            </div>
          </div>
        </div>
      </qrcode-stream>
    </div>
  </div>
</template>
<script>
// 下载插件
// cnpm install --save  vue3-qr-reader
// 引入
import { QrcodeStream, QrcodeDropZone, QrcodeCapture } from 'vue3-qr-reader'
export default {
  // 注册
  components: {
    QrcodeStream,
    QrcodeDropZone,
    QrcodeCapture
  },
  data() {
    return {
      result: '', // 扫码结果信息
      error: '', // 错误信息
      scancode: true
    }
  },
  methods: {
    //回调扫描结果
    onDecode(result) {

      if (result !== "") {
        this.scancode = false;
        this.$emit("ok", result)
      }

    },
    // 检查是否调用摄像头
    async onInit(promise) {
      try {
        await promise
      } catch (error) {
        if (error.name === 'NotAllowedError') {
          this.error = "ERROR: 您需要授予相机访问权限"
        } else if (error.name === 'NotFoundError') {
          this.error = "ERROR: 这个设备上没有摄像头"
        } else if (error.name === 'NotSupportedError') {
          this.error = "ERROR: 所需的安全上下文(HTTPS、本地主机)"
        } else if (error.name === 'NotReadableError') {
          this.error = "ERROR: 相机被占用"
        } else if (error.name === 'OverconstrainedError') {
          this.error = "ERROR: 安装摄像头不合适"
        } else if (error.name === 'StreamApiNotSupportedError') {
          this.error = "ERROR: 此浏览器不支持流API"
        }
      }
    },
  }
}
</script>
<style lang="scss" scoped>
@import "@/assets/init.scss";

#cryptos {
  .error {
    font-weight: bold;
    color: red;
  }

  .scan {
    width: 100vw;
    border-color: #585858;
    position: fixed;
    top: 0;
    left: 0;
  }

  .qrcode-stream-camera {
    width: 100%;
    height: 100%;
    display: block;
    -o-object-fit: cover;
    object-fit: cover;
    position: absolute;
    top: 0%;
    left: 0%;
  }

  .qr-scanner {
    background-image:
      linear-gradient(0deg,
        transparent 24%,
        rgba(32, 255, 77, 0.1) 25%,
        rgba(32, 255, 77, 0.1) 26%,
        transparent 27%,
        transparent 74%,
        rgba(32, 255, 77, 0.1) 75%,
        rgba(32, 255, 77, 0.1) 76%,
        transparent 77%,
        transparent),
      linear-gradient(90deg,
        transparent 24%,
        rgba(32, 255, 77, 0.1) 25%,
        rgba(32, 255, 77, 0.1) 26%,
        transparent 27%,
        transparent 74%,
        rgba(32, 255, 77, 0.1) 75%,
        rgba(32, 255, 77, 0.1) 76%,
        transparent 77%,
        transparent);
    background-size: 3rem 3rem;
    background-position: -1rem -1rem;
    width: 100%;
    /* height: 100%; */
    height: 100vh;
    position: relative;
    background-color: #1110;

    /* background-color: #111; */
  }

  .qr-scanner .box {
    width: 213px;
    height: 213px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    overflow: hidden;
    border: 0.1rem solid rgba(0, 255, 51, 0.2);
    /* background: url('http://resource.beige.world/imgs/gongconghao.png') no-repeat center center; */
  }

  .qr-scanner .line {
    height: calc(100% - 2px);
    width: 100%;
    background: linear-gradient(180deg, rgba(0, 255, 51, 0) 43%, #00ff33 211%);
    border-bottom: 3px solid #00ff33;
    transform: translateY(-100%);
    animation: radar-beam 2s infinite alternate;
    animation-timing-function: cubic-bezier(0.53, 0, 0.43, 0.99);
    animation-delay: 1.4s;
  }

  .qr-scanner .box:after,
  .qr-scanner .box:before,
  .qr-scanner .angle:after,
  .qr-scanner .angle:before {
    content: '';
    display: block;
    position: absolute;
    width: 3vw;
    height: 3vw;

    border: 0.2rem solid transparent;
  }

  .qr-scanner .box:after,
  .qr-scanner .box:before {
    top: 0;
    border-top-color: #00ff33;
  }

  .qr-scanner .angle:after,
  .qr-scanner .angle:before {
    bottom: 0;
    border-bottom-color: #00ff33;
  }

  .qr-scanner .box:before,
  .qr-scanner .angle:before {
    left: 0;
    border-left-color: #00ff33;
  }

  .qr-scanner .box:after,
  .qr-scanner .angle:after {
    right: 0;
    border-right-color: #00ff33;
  }

  @keyframes radar-beam {
    0% {
      transform: translateY(-100%);
    }

    100% {
      transform: translateY(0);
    }
  }
}
</style>

